The peculiar nebula Simeis 57 - II. Distance, nature and excitation

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Fig. 2

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Hα line emission map of Simeis 57 with the subregions A, B, C, and D. The black contours correspond to DRAO 1420 MHz radio continuum flux densities of 20, 25, and 30 mJy arcmin⁻². The red crosses denote the central positions of the IDS long-slit spectra from Table 1 and Fig. 3.

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